JP3978211B2 - Paper machine smoothing press and paper machine press with smoothing press - Google Patents

Description

The present invention relates to a smoothing press and smoothing press with paper machine pre scan of a paper machine.

FIG. 9 and FIG. 10 are diagrams for explaining a conventional press device of a general paper machine, FIG. 9 is a schematic configuration diagram of the no-open draw type press, and FIG. 10 is an outline of the open draw type press. It is a block diagram.
As shown in FIG. 9, the no-open draw type press is a press in which the wet paper web 1 travels in a state where both sides or one side of the wet paper web 1 is always held by a felt or a belt in the press section 2 of the paper machine. As shown in FIG. 10, the open draw type press is a press configuration in which the wet paper web 1 travels in a state in which both sides of the wet paper web 1 are not held by felts, belts or the like in the press section 2 of the paper machine. Say.

As shown in FIG. 9, in a general no-open draw type press, the wet paper 1 that has passed through the press or former on the upstream side of the final squeeze press 4 of the paper machine is sucked by the suction roll 5a to the felt 6a. After being held, it is conveyed to the final squeeze press 4 while being sandwiched between the felt 6a and the felt 6b.
In this example, the final squeezing press 4 includes a press roll (or shoe press) 4a and a press roll 4b, and the moisture contained in the wet paper 1 is absorbed by the nip pressure of the press rolls 4a and 4b. It moves to the felts 6a and 6b and squeezes water.

  The wet paper 1 squeezed by the final squeezing press 4 is sucked by the suction roll 5b and held by the felt 6b, and then sucked by the suction roll 5c and held by the canvas 7a. Be transported. In addition, when the paper passing belt which does not have air permeability and does not absorb moisture at all is provided instead of the felt 6b, it is not necessary to provide the suction roll 5b.

Thereafter, the wet paper 1 passes through the first dryer 3a, the second dryer 3b, and the third dryer 3c of the dryer unit 3 and the wet paper 1 is dried. In addition, the code | symbol 7a in FIG. 9 is a canvas, and the codes | symbols 20a and 20b are vacuum rolls.
Such no-open draw type presses include, for example, US Pat. No. 5,611,891 (hereinafter referred to as Patent Document 1) and Japanese Patent Publication No. 3-45156 (US Pat. No. 4,493,351, hereinafter referred to as Patent Document 2). In these techniques of Patent Documents 1 and 2, the structure is such that water is squeezed in a state where the wet paper is held on the felt or belt in the press section (that is, no-open draw) and then transferred to the dryer section 3. It has become.

  Further, as shown in FIG. 10, in a general open draw type press, the wet paper 1 is squeezed at the nip portion of the press rolls 9a and 9b while being sandwiched between the felts 6c and 6d, and then the felt 6c. One side is held by the press roll (center roll) 9c and the press roll 9d, and the press roll 9c and the press roll (or shoe press) are pressed by the felt 6e. ) Water is squeezed at the nip with 9e.

After that, the wet paper 1 is sucked by the suction roll 5d through the paper roll 18 by an open draw, and one side is held by the felt 6f, and the press roll 4c and the press roll (or shoe press) of the final water press 4 ) After being squeezed at the nip with 4d, it is conveyed to the smoothing press 10 via the paper roll 8 by an open draw.
The smoothing press 10 is provided on the downstream side of the final squeezing press 4, and a press roll 10a having a soft cover (for example, a rubber outer cover) attached to the surface and a hard cover (an outer cover harder than the soft cover) attached to the surface. And a press roll 10b.

  This smoothing press 10 generates a nip pressure lower than that of a normal press, and one press roll surface is a soft surface [JIS standard (JIS K 6253) type A, 85 ° to 95 °. The nip width can be ensured, and the smoothness of the surface of the wet paper 1 can be improved while maintaining the bulk of the wet paper 1 at the nip portion of the smoothing press 10.

Such an open draw type press is disclosed in, for example, the catalog “Mitsubishi-Beloit Press” (September 1980, hereinafter referred to as Non-Patent Document 1). A smoothing press is installed on the side, and the wet paper on the upstream side and downstream side of the smoothing press is conveyed by open draw.
By the way, in the no-open draw type press as described above, since the wet paper 1 is held by the felt or belt, the wet paper 1 can be stably driven even at high speed operation, and the wet paper 1 is damaged. Can be prevented, and the paper passing property is also improved.

However, in such a no-open draw type press, there is a possibility that the smoothness of the surface of the wet paper 1 in contact with the felts 6a and 6b is lowered.
In particular, recently, there is a tendency to reduce the number of press devices in the press part. If the number of press devices is reduced, the number of nip parts is reduced, so that the water extraction efficiency in the press part is lowered. For this reason, it is conceivable to improve the dewaterability by using a felt having a thicker fiber diameter (bat diameter) on the surface, but the smoothness of the surface of the wet paper 1 is further lowered. More specifically, in a normal multi-stage press, a felt having a large surface fiber diameter (bat diameter) (14 to 18d) is used for the front press with emphasis on water squeezing, and surface properties are used for the subsequent press. Emphasis is placed on the use of felt (6 to 10 d) with a thin fiber diameter (bat diameter) on the surface layer, but the smoothness of the paper on the felt side tends to be lower (rougher) than that on the roll side. In particular, when the number of press stages is reduced, the felt is required to have functions of contradicting water squeezing and smoothness, and it is not sufficient to deal with only the felt side.

  Therefore, in order to improve the smoothness of the wet paper 1 with a no-open draw type press, it is conceivable to install the above-described smoothing press 10 on the downstream side of the final squeezing press 4, but in the first place, the conventional smoothing press 10 is It is a structure applicable only to an open draw type press, and it is difficult to install the smoothing press 10 in a no-open draw type press with the structure as it is.

  On the other hand, in the open draw type press described above, since the smoothing press 10 is installed, it is possible to improve the smoothness of the wet paper 1, but when the high speed operation is performed as shown in FIG. In general, the vibration of the apparatus becomes large, and the surface of the soft cover press roll 10a of the smoothing press 10 becomes uneven (polygonalized), resulting in more intense vibration, making high speed operation difficult. There was a problem.

In the open draw type press, the wet draw paper 1 is easily cut at the open draw portion when the high speed operation is performed because the open draw portion of the wet paper web 1 is long on the upstream side and the downstream side of the smoothing press 10. It is difficult to improve paper permeability.
As described above, the conventional no-open draw type press and the open draw type press have merits and demerits. In particular, when trying to speed up the operation of the paper machine, the smoothness of the wet paper 1 while keeping the wet paper 1 running stably. It was difficult to improve.

  The present invention was devised in view of such a problem, and is capable of improving wet paper passing and smoothness even during high-speed operation of the paper machine. Paper machine with smoothing press and paper with smoothing press It is an object of the present invention to provide a machine press and a paper manufacturing method.

The present invention takes the following means in order to solve the above-mentioned problems.
That is, the smoothing press of the paper machine of the present invention is a smoothing press that is provided as the final stage press of the press section of the paper machine and functions to smooth the surface of the running wet paper, An elastic member that guides the running of the wet paper while holding the web, a first press roll that is in contact with the other surface of the wet paper and has a surface made of a hard material, and a surface that is made of a hard material. and a second press roll for pressing the wet web by generating a nip pressure in cooperation with the first press roll through the member, the wet web, the said first press roll first After the nip pressure is applied by the second press roll, it moves to the canvas together with the first press roll, and is transferred to the dryer section through the canvas .

According to the smoothing press of the paper machine of the present invention, the second press roll whose surface is formed of a hard material generates a nip pressure between the second press roll and the first press roll via the elastic member, thereby removing the wet paper. Since it presses, a press roll does not become polygonal and generation | occurrence | production of a vibration can be prevented. As a result, it is possible to improve the paper passing property and smoothness of the wet paper even during high-speed operation of the paper machine.
In the case of no-open draw type presses, there are many examples in which a shoe press is applied, and the smoothness of wet paper tends to deteriorate due to its high water squeezing performance. Even in the case of pressing, the smoothness of the wet paper can be improved.

A final squeezing press that squeezes the wet paper with its nip pressure is provided on the upstream side of the first press roll and the second press roll, and the elastic member includes the first press roll and the second press roll. While passing through the nip portion between the first press roll and the second press roll, it is preferable not to pass through the nip portion of the final water press.
The elastic member is preferably a paper passing belt that does not have air permeability. Or it is preferable that the said elastic member is the felt for surface property improvement which has air permeability.

Moreover, it is preferable that the hardness of the surface of a said 1st press roll and a 2nd press roll is JIS99 degrees or more and JIS100 degrees or less.
A first paper machine press with a smoothing press according to the present invention is a paper machine press provided with a smoothing press in which the elastic member is a paper passing belt. The press of the press section is provided upstream of the smoothing press. A pair of conveyor belts that transport the wet paper from the final water press to the smoothing press; and a pair of nip pressures generated on the wet paper with the wet paper sandwiched between the conveyor belt and the paper passing belt A nip transfer roll is provided, and the hardness of the paper passing belt is set higher than the hardness of the conveying belt.

According to the first paper machine press with a smoothing press of the present invention, since the hardness of the paper passing belt is set higher than the hardness of the conveying belt, the nip pressure is applied to the wet paper by the nip transfer roll. It is possible to transfer from the conveyor belt to a paper feeding belt having higher hardness.
A second paper machine press with a smoothing press according to the present invention is a paper machine press provided with a smoothing press in which the above-mentioned elastic member is a felt for improving surface properties, the press on the upstream side of the smoothing press. A felt for transporting the wet paper from the final squeezing press to the smoothing press, and a suction roll for sucking the wet paper on the transport felt through the felt for improving surface properties. It is a feature.

According to the second paper machine press with the smoothing press of the present invention, the wet paper is sucked through the surface property improving felt having air permeability, so that it can be transferred from the conveying felt to the surface property improving felt. It is.
A third paper machine press with a smoothing press according to the present invention is a paper machine press provided with a smoothing press in which the elastic member is a paper passing belt, and a pair of smoothing presses provided on the upstream side of the smoothing press. A nip transfer roll and a guide roll provided on the upstream side of the nip transfer roll are provided, and the paper passing belt is configured to enter the nip portion of the nip transfer roll via the guide roll. It is characterized by that.

  The smoothing press in the present invention is a set of rolls provided as a final stage press of the press section of the paper machine, and is provided for the purpose of smoothing the surface of the wet paper. In addition, since the smoothness of wet paper is improved by the present invention, the present invention is particularly suitable for the production of papers that require smoothness, such as high-quality paper, coated paper, and paperboard. It is not limited.

FIG. 1 is a schematic configuration diagram for explaining a paper machine press with a smoothing press as a first embodiment of the present invention. FIG. 2 is a schematic configuration diagram for explaining a first modification of the first embodiment of the present invention. FIG. 3 is a schematic configuration diagram for explaining a second modification of the first embodiment of the present invention. FIG. 4 is a schematic configuration diagram for explaining a third modification of the first embodiment of the present invention. FIG. 5 is a schematic configuration diagram for explaining a paper machine press with a smoothing press as a second embodiment of the present invention. FIG. 6 is a schematic configuration diagram for explaining a first modification of the second embodiment of the present invention. FIG. 7 is a schematic configuration diagram for explaining a second modification of the second embodiment of the present invention. FIG. 8 is a schematic configuration diagram for explaining a third modification of the second embodiment of the present invention. FIG. 9 is a schematic configuration diagram schematically illustrating a conventional general no-open draw type press. FIG. 10 is a schematic configuration diagram schematically showing a conventional general open draw type press. FIG. 11 is a schematic configuration diagram schematically showing a conventional smoothing press.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(A) 1st Embodiment FIG. 1: is a schematic block diagram for demonstrating the press for paper machines with a smoothing press as 1st Embodiment of this invention. In FIG. 1, the same reference numerals are used for the same parts as those in the conventional example described above.

As shown in FIG. 1, a smoothing press 12 provided in the paper machine press is provided as a final stage press of a press unit 2 of the paper machine. Here, the wet paper 1 is squeezed in the press unit 2. It is provided on the downstream side of the last pressing device (hereinafter referred to as final water press) 4 to be performed.
Here, the final water press 4 includes a press roll (or shoe press) 4a and a press roll 4b, and the moisture contained in the wet paper 1 is absorbed by the nip pressure of the press rolls 4a and 4b. It moves to the felts 6a and 6b and squeezes water.

  The smoothing press 12 has a surface formed of a hard material (for example, a material with a hard cover such as hard rubber or a natural stone or artificial stone represented by a stone roll), and the upper side of the traveling path of the wet paper web 1. A pair of press rolls (second press roll) 12a, a press roll (first press roll) 12b, and a paper passing belt 13 as an elastic member are provided. In addition, it is preferable that said hard cover (namely, the surface of the press roll 12a and the press roll 12b) has the hardness of 99 degrees or more and 100 degrees or less by the type A of JIS specification (JIS K 6253).

The press rolls 12 a and 12 b generate nip pressure on the wet paper 1 via the paper passing belt 13. The paper passing belt 13 is, for example, a rubber belt, and has a structure that is much smoother than ordinary felt and does not have air permeability (does not absorb moisture at all).
By sandwiching the paper passing belt 13 between the press rolls 12a and 12b and generating nip pressure with the press rolls 12a and 12b, the paper passing belt 13 is elastically deformed at the nip portion. It can be secured.

Further, the paper passing belt 13 is passed through the nip portion of a pair of nip transfer rolls 11a and 11b provided on the upstream side of the press rolls 12a and 12b, and is conveyed from the final squeezing press 4 to the felt 6b. The wet paper 1 that has been transferred is transferred to the paper passing belt 13 at the nip portions of the nip transfer rolls 11a and 11b.
Normally, when the nip pressure is applied, the wet paper 1 is attached to the smoother surface and moves, so that the wet paper 1 is sandwiched between the paper passing belt 13 and the felt 6b so that the nip transfer rolls 11a and 11b are sandwiched between them. When the nip pressure is applied, the wet paper 1 is attached to the paper passing belt 13 whose surface is smoother than that of the felt 6b, and the travel path is changed from the felt 6b to the paper passing belt 13.

  Since the smoothing press of the paper machine of the present embodiment is configured as described above, as shown in FIG. 1, the wet paper 1 that has passed through a press or former upstream of the final squeezing press 4 is After being sucked by the suction roll 5a and held on one side by the felt 6a, it is conveyed to the final squeezing press 4 while being sandwiched between the felt 6a and the felt 6b, and squeezed by the final squeezing press 4. It is.

After that, the wet paper 1 is sucked by the suction roll 5b and held on one side by the felt 6b, and then nipped at the nip portion of the nip transfer rolls 11a and 11b while being sandwiched between the felt 6b and the paper passing belt 13. The pressure is applied and transferred from the felt 6 b to the paper passing belt 13.
Note that a paper passing belt A may be used instead of the felt 6b. In this case, the paper passing belt A is, of course, composed of a rubber belt or the like whose surface is much smoother than normal felt and does not have air permeability (does not absorb moisture at all). If comprised in this way, in the nip part of the final squeeze press 4, the wet paper 1 sticks and moves to the paper passing belt A whose surface is smoother than the felt 6a, so it is not necessary to provide the suction roll 5b (that is, In this case, the wet paper travels as indicated by a two-dot chain line indicated by reference numeral L in FIG. It is necessary to reduce the properties or to set the hardness low.

  In other words, as described above, the wet paper 1 has the property of sticking to the smoother surface when the nip pressure is applied, and also has the property of sticking to the higher hardness. Therefore, for example, when the surface of the paper passing belt A and the surface of the paper passing belt 13 have substantially the same smoothness, the paper passing belt A is formed with a lower hardness than the paper passing belt 13. When the nip pressure is applied between the nip transfer rolls 11a and 11b, the wet paper 1 is attached to the paper passing belt 13 having higher hardness than the belt and moves.

The wet paper 1 transported via the nip transfer rolls 11a and 11b has a nip pressure at the nip portion of the press rolls 12a and 12b in a state where one side (the wet paper upper face in FIG. 1) is held by the paper passing belt 13. Is added to smooth both sides of the wet paper web 1.
Thereafter, the wet paper web 1 is transferred to the dryer unit 3 via the canvas 7c, and the wet paper web 1 is dried through the first dryer 3a, the second dryer, and the third dryer (not shown) in this order. In addition, the code | symbols 20a and 20b in FIG. 1 are vacuum rolls.

Thus, in the present smoothing press 12, the nip width can be ensured by elastically deforming the paper passing belt 13 interposed between the press rolls 12a and 12b, so that a conventional soft cover press roll is used. There is no need. That is, since the press roll does not become polygonal as in the conventional smoothing press, generation of vibration can be prevented.
In addition, a smoothing press that could only be installed in an open draw type press can be installed in a no-open draw type press, and since there is no open draw part, it is easy to pass paper and stable even during high-speed operation. Thus, the wet paper web 1 can be conveyed. That is, it is possible to increase the speed of the paper machine, and it is possible to improve the paper passing property and smoothness of the wet paper 1 even during high-speed operation of the paper machine.

As a result, it is possible to reduce the load on a calendar device (not shown) that is disposed on the downstream side of the dryer unit 3 and performs the surface treatment of the wet paper 1, and in particular, there is an effect that it is easy to produce bulky paper.
Moreover, in the conventional no-open draw type press, there are many examples in which a shoe press is applied, and the smoothness of the wet paper web 1 tends to deteriorate due to its high water-squeezing performance, but the smoothing press can be used in combination with the present invention. Even in the case of a shoe press, the smoothness of the wet paper 1 can be improved.

(A-1) Modification 1
FIG. 2 is a schematic configuration diagram illustrating a first modification of the first embodiment. Hereinafter, differences from the first embodiment will be described.
As shown in FIG. 2, in Modification 1, a guide roll 19 is provided on the upstream side of the nip transfer rolls 11 a and 11 b, and the sheet passing belt 13 passes through the guide roll 19 and the nip portion of the nip transfer rolls 11 a and 11 b. It is supposed to rush into.

  In other words, the guide roll 19 changes the travel line of the paper passing belt 13 immediately before the nip portion of the nip transfer rolls 11a and 11b, and thereby the paper passing when moving along the nip transfer rolls 11a and 11b. Since the sudden bending of the belt 13 can be alleviated, the expansion and contraction of the paper passing belt 13 immediately before and after the nip portion can be prevented.

Thereby, the wrinkle of the wet paper 1 can be prevented. Further, since the wet paper 1 can be reliably held on the paper belt 13, the wet paper 1 can be stably conveyed even after the wet paper 1 has passed through the nip portion.
(A-2) Modification 2
FIG. 3 is a schematic configuration diagram illustrating a second modification of the first embodiment. Hereinafter, differences from the first embodiment will be described.

As shown in FIG. 3, in Modification 2, a surface property improving felt 14 is provided instead of the paper passing belt 13, and a suction roll 5c is provided instead of the nip transfer rolls 11a and 11b.
The surface property improving felt 14 has air permeability, but its surface is formed much smoother than that of a normal water squeezing felt. It functions to be smooth. A normal felt for water squeezing has an air permeability of about 20 cc / (sec · cm ² ), but the surface property improving felt 14 in the present invention is set to an air permeability of 10 cc / (sec · cm ² ) or less.

  As a result, the wet paper 1 held and conveyed by the felt 6b is sucked by the suction roll 5c and transferred to the surface property improving felt 14, and the surface of the wet paper 1 is smoothed at the nip portion of the press rolls 12a and 12b. Is performed. At this time, as described above, since the surface property improving felt 14 having a lower air permeability than that of a normal water squeezing felt is used, not only the surface of the wet paper 1 on the press roll 12b side but also the wet paper felt. It is also possible to improve the smoothness of the surface of the paper 1 on the surface property improving felt 14 side.

In addition, it is not necessary to install the nip transfer rolls 11a and 11b shown in FIG.
(A-3) Modification 3
FIG. 4 is for explaining a third modification of the first embodiment, and is a schematic configuration diagram when the smoothing press of the first embodiment is applied to the conventional paper machine press shown in FIG.

As shown in FIG. 4, in the modified example 3, a paper passing belt 15 having lower smoothness or lower hardness than the paper passing belt 13 is stretched around the press roll 9c, and the paper passing is made by the nip transfer rolls 11a and 11b. The wet paper 1 held by the belt 15 is transferred to the paper belt 13.
Accordingly, the wet paper 1 is squeezed at the nip portion of the press rolls 9a and 9b while being sandwiched between the felts 6c and 6d, and then the nip portion between the press roll 9c and the press roll 9d, and the press roll 9c. And the press roll (or shoe press) 9e.

Thereafter, the wet paper 1 is held by the paper passing belt 15 (no open draw), receives the nip pressure of the nip transfer rolls 11a and 11b, is transferred to the paper passing belt 13, and is wet by the press rolls 12a and 12b. The surface of the paper 1 is smoothed.
Thus, the conventional paper machine press (cluster press) as shown in FIG. 10 is configured by applying the paper belt 15 to the press roll 9c and transferring the wet paper 1 by the nip transfer rolls 11a and 11b. It is also applicable to. Further, it is possible to apply a surface property improving felt instead of the paper passing belt 13 and apply a suction roll instead of the nip transfer rolls 11a and 11b.

(B) 2nd Embodiment FIG. 5: is a schematic block diagram for demonstrating the press for paper machines with a smoothing press as 2nd Embodiment of this invention.
Hereinafter, differences from the first embodiment will be described.
As shown in FIG. 5, in the smoothing press 12 provided in the paper machine press, the paper passing belt 13 passed over the press roll 12 a is also passed over the nip portion of the final water press 4. Yes.

Further, nip transfer rolls 11a and 11b are provided on the upstream side of the final squeezing press 4, and the wet paper web 1 conveyed via a press or former on the upstream side of the final squeezing press 4 is The nip transfer rolls 11a and 11b are used to transfer to the paper passing belt 13.
Since the smoothing press of the paper machine of this embodiment is configured as described above, as shown in FIG. 5, the wet paper web 1 that has passed through the press or former on the upstream side of the final water press 4 is nip transfer. After being transferred from the felt to the paper passing belt 13 by the rolls 11 a and 11 b, water is squeezed at the nip portion of the final water press 4 while being sandwiched between the felt 6 b and the paper passing belt 13.

The wet paper 1 enters the nip portion between the press rolls 12a and 12b of the smoothing press while being held by the paper passing belt 13, and the surface of the wet paper web 1 is smoothed at the nip portion. Thereafter, the wet paper 1 is transferred to the dryer unit 3 and dried.
As described above, according to the paper machine press, the suction rolls 5a and 5b and the felt 6a (see FIG. 1) of the first embodiment are not required, so that the cost is reduced in addition to the effects of the first embodiment. In addition, the device can be made compact.

(B-1) Modification 1
FIG. 6 is a schematic configuration diagram illustrating a first modification of the second embodiment. Hereinafter, differences from the second embodiment will be described.
As shown in FIG. 6, in the first modification, instead of the nip transfer rolls 11a and 11b, a suction roll 5d that sucks the wet paper 1 conveyed from the upstream press 16 upstream of the final squeeze press 4 and this Felt 17 that holds and conveys wet paper 1 sucked by suction roll 5d and suction roll 5e that sucks wet paper 1 held by felt 17 and transfers it to felt 6b is provided. ing.

(B-2) Modification 2
FIG. 7 is a schematic diagram for explaining a second modification of the second embodiment, in which the smoothing press according to the second embodiment is applied to the conventional paper machine press shown in FIG.
As shown in FIG. 7, in the second modification, the wet paper 1 passes through the nip portion between the press roll 9c and the press roll 9e, and then is transferred to the felt 6f through the paper roll 18 by an open draw. . Then, after being squeezed by the final squeezing press 4 while being held by the felt 6 f and the paper passing belt 13, the surface of the wet paper 1 is applied by the smoothing press 12 with one side being held by the paper passing belt 13. Smoothing is performed.

By comprising in this way, an open draw part can be reduced significantly and the paper permeability of the wet paper 1 can be improved.
(B-3) Modification 3
FIG. 8 is for explaining a third modification of the second embodiment, and is a schematic configuration diagram when the smoothing press of the second embodiment is applied to the conventional paper machine press shown in FIG.

As shown in FIG. 8, in Modification 3, a paper passing belt 15 having a lower hardness than the paper passing belt 13 is stretched around the press roll 9 c.
Accordingly, the wet paper 1 passes through the nip portion between the press roll 9c and the press roll (or shoe press) 9e and is then held by the paper passing belt 15 (no open draw), so that the nip transfer rolls 11a and 11b After being transferred to the paper passing belt 13 under the nip pressure, the water is squeezed by the final squeezing press 4 and the surface of the wet paper 1 is smoothed by the smoothing press 12 with one side held by the paper passing belt 13. Done.

In this way, by applying the paper feeding belt 15 to the press roll 9c and transferring the wet paper 1 by the nip transfer rolls 11a and 11b, the present invention can be applied to the conventional paper machine press shown in FIG. .
(C) Others Although the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.

  For example, in the above embodiment, the hard cover is mounted on the surface of the press rolls 12a and 12b of the smoothing press. However, the press roll surface itself is formed with high hardness and the surface of the press roll can be used without using the cover. The surface of the wet paper 1 may be directly smoothed.

  As described above, according to the smoothing press of the present invention, the press roll does not become polygonal even during high-speed operation of the paper machine, and the occurrence of vibration can be prevented. Since the paper passing property and smoothness can be improved, its usefulness is considered to be extremely high.

Claims (8)

A smoothing press that is provided as a final press in a press section of a paper machine and functions to smooth the surface of a moving wet paper,
An elastic member that guides the running of the wet paper while holding one surface of the wet paper;
A first press roll in contact with the other surface of the wet paper and having a surface formed of a hard material;
Surface is formed of a hard material, and a second press roll for pressing the wet web by generating a nip pressure in cooperation with the first press roll through the elastic member,
After the nip pressure is applied by the first press roll and the second press roll, the wet paper moves to the canvas together with the first press roll, and is transferred to the dryer section through the canvas. that wherein the <br/>, the smoothing press of the paper machine. On the upstream side of the first press roll and the second press roll, a final squeezing press that squeezes the wet paper with its nip pressure is provided,
The elastic member is passed through the nip portion between the first press roll and the second press roll, but is not passed through the nip portion of the final water press.
The smoothing press of the paper machine of Claim 1 characterized by the above-mentioned. The smoothing press for a paper machine according to claim 1 or 2 , wherein the elastic member is a paper passing belt having no air permeability. The smoothing press for a paper machine according to claim 1 or 2 , wherein the elastic member is a surface property improving felt having air permeability. The smoothing press according to any one of claims 1 to 4 , wherein the surface hardness of the first press roll and the second press roll is JIS 99 ° or more and JIS 100 ° or less. A paper machine press provided with the smoothing press according to claim 3 ,
On the upstream side of the smoothing press, a transport belt that transports the wet paper from the final squeezing press of the press unit to the smoothing press, and a state in which the wet paper is sandwiched between the transport belt and the paper passing belt And a pair of nip transfer rolls for generating nip pressure on the wet paper,
A paper machine press with a smoothing press, wherein the hardness of the paper passing belt is set higher than the hardness of the transport belt. A paper machine press comprising the smoothing press according to claim 4 ,
At the upstream side of the smoothing press, a suction felt for transporting the wet paper from the final squeezing press of the press section to the smoothing press, and the wet paper on the transport felt is sucked through the felt for improving surface properties. A press for a paper machine with a smoothing press, characterized in that it has a suction roll. A paper machine press provided with the smoothing press according to claim 3,
  A pair of nip transfer rolls provided upstream of the smoothing press;
  A guide roll provided on the upstream side of the nip transfer roll;
  The paper passing belt is configured to enter the nip portion of the nip transfer roll through the guide roll.
A press for a paper machine with a smoothing press.

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